Experimental Study on the Decomposition Products of CF3I/N2Gas Mixtures

Sulfur hexafluoride (SF6) has been limited to use because its high global warming potential (GWP). Iodotrifluoromethane (CF3I) is a potential alternative to SF6, which has advantages on environmental performance. But due to its instability, it may decompose during discharge process. The decomposition products may affect the insulating characteristics of Cf3I/N2. In this paper the decomposition products are detected include C2F6, C2F4, C3F8 and their quantities after 50, 100, 150 and 200 times of discharge in non-uniform electric field and analyzed the breakdown voltages after different times discharge. The decompositions of Cf3I/N2 can change the components of insulating gas and have the solid decomposition iodine. But the amount of decomposition will not be very large and it will not have a significant impact on the insulation properties after limited and transient discharges.